Early Period, Brown Spotting, Nausea post period..Any Answer

Hello Ladies.. Hopefully someone can help me out with this, or at least give me some insight. My period was supposed to come on 04/11/07 (+/- a day) however is came on 04/05/07. The 1st day I had horrible cramps and was heavy, the 2nd day I was heavy that morning and by that evening very light and brown, the 3rd I was spotting brown along with 4th and 5th day. It was slim to minimal brown spotting. This morning when I woke up I felt Nauseated and just all together yucky, along with a clear watery discharge with no smell etc, but it was rather much, almost with the feeling I'm back on my period but am not. (FYI- I only have one ovary as I have had surgery for ovarian cyst and have been cyst free for almost 2 years) My boyfriend and I have unprotected sex and I've heard that there are woman who have came on their periods while being pregnant but didn't know that they were pregnant. I'm very tempted to take a test however I will feel pointless if I take it and get a negative response. Any Ideas of what could be going on and as to weither I should take a test or not?

Any type of feedback would be greatly appreciated